If 5w-30 is working fine, you may continue using it.
That 10w-40 sticker is general, and is affixed by Pak Suzuki in almost all of their cars, irrespective of caste, gender, creed, religion, etc. Do not worry about it.
They even affix the very same sticker with old API ratings in PKDM Brand new 660 cc Alto, which basically requires 0w-20 in it.